SQLite MIN()
函数用于获取表达式或给定列的最小值。
语法
SELECT MIN(aggregate_expression)
FROM tables
[WHERE conditions];
在GROUP BY
子句中使用Min()
函数时的语法:
SELECT expression1, expression2, ... expression_n
MIN(aggregate_expression)
FROM tables
[WHERE conditions]
GROUP BY expression1, expression2, ... expression_n;
示例1:
假设有一个名为student
的表,具有以下数据:
从student
表中检索学生的最低费用(fees
):
SELECT MIN(FEES) AS "Lowest Fees" FROM STUDENT;
-- 最小年龄
SELECT MIN(age) AS "Lowest age" FROM STUDENT;
执行上面查询代码,得到以下结果 –
sqlite> SELECT MIN(FEES) AS "Lowest Fees" FROM STUDENT;
2000.0
sqlite>
sqlite> SELECT MIN(FEES) AS "Lowest Fees" FROM STUDENT;
2000.0
sqlite>
sqlite> -- 最小年龄
sqlite> SELECT MIN(age) AS "Lowest age" FROM STUDENT;
21
sqlite>
示例2:
使用具有的GROUP BY子句的MIN()
函数:
从student
表中检索NAME
和MIN FEES
,并按NAME
的数据排序:
SELECT NAME, MIN(FEES) AS "Lowest Fees"
FROM STUDENT
WHERE ID <= 8
GROUP BY NAME;
执行上面代码,得到以下结果 –
sqlite> SELECT NAME, MIN(FEES) AS "Lowest Fees"
...> FROM STUDENT
...> WHERE ID <= 8
...> GROUP BY NAME;
Avgsu|2000.0
Javasu|18000.0
Linsu|10000.0
Maxsu|20000.0
Minsu|5000.0
Sqlsu|25000.0
sqlite>